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Blargg's NTSC shaders are powerful and optimized, but they are very system specific. There is a version for NES, SNES, SMS, and Genesis/Mega Drive, and each is intended for that system only, expecting a certain size input resolution. Certain games on other systems than the intended one can still make use of them, but not without glitches. For instance, on certain [[PS1]] games that have multiple resolutions, some of the resolution modes will work properly with these filters, and some won't. This may mean the aspect ratio is horribly messed up for menus, but the main gameplay will look normal. These filters upscale the image wide horizontally, but don't touch the vertical scale, so 1:1 PAR may result in weird aspect ratios.
In some emulators, it will have sliders for settings such as Resolution (level of signal blur), Sharpness (sharpness/comb filter that some TVs used), Color Bleed, Artifacts, and Fringing. Others simply use the preset settings. Note: RF preset is just composite with field merging disabled, so it emulates the oscillating artifacts composite output has(Go [http://www.chrismcovell.com/gotRGB/screenshots.html here] and see the 3rd image on the right for an example of this).
===Maister NTSC===
